Patent GB-413123-A (GB)
Title: Improvements in gramophone needle feeding devices
IPC: G11B3/46
Filed: 1933-06-27
Abstract: 413,123. Gramophones. NEUMANN, H., 10, F³hrichgasse, Vienna, and HYRA, E., Langenwang, near Murzzuschlag, both in Austria. June 27, 1933, Nos. 18327 and 18328. Convention dates, Oct. 15, 1932 and April 7, 1933. [Class 40 (ii).] A gramophone needlefeeding device consists of a casing 3, mounted on the sound-box 1 and provided with a disc 4, which has a slot 7 and is rotatable so as to bring the slot 7 either into coincidence with a slot 8 in the front wall of the casing, for the purpose of receiving a needle from a magazine 10 mounted on the casing, or into alignment with a discharge port 15 positioned in the casing over the needle-holder 2. The magazine 10 is mounted in guides 11 on the casing 3 and is provided with a slidable lid 12 which is adapted to face the wall of the casing 3. Stop members on the guide 11 serve to position the magazine and lid so as to leave an opening coinciding with the slot 8 in the casing 3. The disc 3 is operated by a handle 6 extending through a slot 5 in the wall of the casing, such slot being adapted to limit the rotation of the casing between the position in which a needle is fed from the magazine to the slot 7 and the position in which the slot 7 is in alignment with the port 15. A spring 9 serves to return the disc to the needle-receiving position. The action of turning the needle-clamping screw 16 of the needle holder 2 to release a needle moves a fork-shaped tray 17 below the holder to support the fresh needle which is supplied from the port 15. The needles in the magazine may be pressed downwards by a spring or by a weight 44, Fig. 5, provided with a resilient tongue 46 engaging a toothed rack 45 in the back wall of the magazine. The bearing surface of the weight 44 is chamfered. A plunger 19, Fig. 6, may be actuated against a spring 20 for ejecting a needle from the slot 7. In a modified device, the needle-supporting tray 17 is in the form of a lever pivotally mounted on the casing 3 as shown in Figs. 8 and 9 and is adapted to be moved into and out of operative position by the action of the end faces 42, 43 of the disc 4 contacting with this lever. The needle is clamped in the holder 2 by the shaped face 361 of a lever 36 which is pivoted on a pin 38 in a slot 37 in the holder and is acted upon by a spring 40. When the disc 4 is rotated to feed a fresh needle to the holder, a lever 35, which is pivoted on the casing 3 and has a pin 34 guided in a groove 33 in the disc 4, is adapted to disengage the lever 36 to release the old needle. A stop 30 of the disc 4 then strikes a pawl 27 co-operating with a lever 25, Fig. 8, whereby the latter is moved downwardly against a spring 26 and pushes a pin 22, which is fixed to a slide 21, into the bore of the needle holder so as to eject the needle. The stop 30 then moves off the pawl 27 to allow the spring 26 to withdraw the pin 22, which is also engaged by a wedge surface 32 on the disc 4, whereby, since the slide 21 is mounted on a plate spring 31, the pin 22 is moved out of alignment with the needle holder. After a fresh needle has been fed to the holder, the disc 4 is returned by the spring 9 and the wedge surface 32 leaves the pin 22, which is then moved by the spring 31 into alignment with the needle holder. The lever 35 operates the lever 36 into clamping engagement with the needle. The lever 36 is provided with a projection 39 which serves to obstruct the upper end of the bore of the needle holder. when the needle is in position.